HID: core: Add bus define for SoundWire bus

SDCA (SoundWire Device Class for Audio) uses HID to convey
input events from peripheral devices. Add a bus define for the
SoundWire bus to prepare support for this.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Author: charleskeepax

drivers/hid/hid-core.c

@@ -2294,6 +2294,9 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
 	case BUS_I2C:
 		bus = "I2C";
 		break;
+	case BUS_SDW:
+		bus = "SOUNDWIRE";
+		break;
 	case BUS_VIRTUAL:
 		bus = "VIRTUAL";
 		break;

include/uapi/linux/input.h

@@ -275,6 +275,7 @@ struct input_mask {
 #define BUS_CEC			0x1E
 #define BUS_INTEL_ISHTP		0x1F
 #define BUS_AMD_SFH		0x20
+#define BUS_SDW			0x21
 
 /*
  * MT_TOOL types